I'm a guitar player that can fake some bass. I'm not so great at the standard index/middle right hand technique, and tend to use my thumb (or a pick when it fits). The thing is, if I do so for too long (and not long really, usually just a couple songs) I get a wicked blister. It's not your usual blister though, it's at a much deeper layer under the skin than your usual blister. In fact I sat in a couple nights ago on maybe 3 songs and while I can't even see the blister I know it's there and it's painful. What's odd is it usually doesn't develop until 2 or 3 days after. So I'm going to get a short scale bass soon for tracking demos but was also hoping to be able to cover pickup gigs if they should come up. Any idea how to handle this? Last time I got the blister I tried playing with a band-aid over it but it was too painful, maybe I need to start with the band-aid as a preemptive measure? I know other guys play with their thumb, I'd assume I just need to build up a callus but I don't see that happening, like I said these blisters are so much deeper than that top layer of skin. Any thoughts are appreciated!